JPS6029442Y2 - Road expansion joint structure - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a road expansion joint that is suitable for locations where the joint spacing is relatively large and the amount of expansion and contraction of the road due to environmental temperature changes is large.

Among the various road expansion joints, most of the one-piece construction have an elastic body as their base, and the representative one is
This is the structure shown in the figure.

In other words, an elastic body (synthetic rubber, etc.) with a rectangular cross section is used as the base, L-angle materials A and B are placed on the bottoms of both sides, and a top plate C such as a steel plate is embedded in the upper center of the base. , grooves d on the upper side of the upper surface and in the center of the lower surface, respectively.
It has a structure with holes d and e, and anchor bolts buried in position controlled on the road floor plates f and f facing each other at the joint are passed through the bolt holes drilled in the L-angle members and b on both sides. It is fixed with a nut.

In this conventional structure, the amount of expansion and contraction of the road is absorbed by the deformation of the grooves d, d and e due to the elastic deformation of the base body a.

However, there is a limit to the width and depth of these grooves b and e due to the strength of the joint, and if they are used in areas where there is a large amount of expansion and contraction on roads, there is a tendency for early fatigue such as cracks in the base body a.

In addition, if the width and thickness of the joint are increased to increase the amount of expansion and contraction that can be accommodated, the center portion will bulge upward during compression.
This can lead to early fatigue of the joints and damage to the connection to the road floorboard.

In view of the above, in order to more effectively expand the amount of expansion and contraction, the present invention has been developed by creating an expansion joint as shown in Figure 4, in which an expansion and contraction section having a corrugated structure is integrally formed on the side surface of the expansion joint as shown in Figure 1. developed.

The expansion joint shown in Fig. 4 has a corrugated expansion part integrally formed on the side surface of the conventional expansion joint shown in Fig. 1, which sufficiently absorbs the amount of change in the joint spacing. It is suitable for

However, as a result of experiments, it has been found that this expansion joint has the following unsatisfactory points.

■ When the elastic part of the corrugated structure is compressed, the compressive force is dispersed in the vertical direction, but since there is no space for the distributed downward force to escape, it acts upward, and as a result, the corrugated structure get excited.

■ Since the expansion joint has a structure that is fixed to the floor slab at both ends with anchor bolts, not only the expansion and contraction part of the corrugated structure but also the part corresponding to the expansion joint shown in Figure 1 rises upward due to compression. .

In view of this, the present inventor conducted further research in order to obtain an expansion joint that can maintain flatness even when compressed, and as a result completed the present invention.

That is, the present invention solves the unsatisfactory points shown in FIG. 4 by using the following configuration, and provides an expansion joint that can be expected to increase the amount of expansion and contraction.

■ The expansion and contraction part of the corrugated structure is changed to the elastic part of the bellows structure to make it difficult for the compressive force to be dispersed in the vertical direction, thereby eliminating the upward swelling.

(2) Anchor bolt mounting holes were provided in parts other than both ends of the expansion joint, and the upward bulge of the sliding part (section F in Figure 4) was eliminated by the anchor bolts.

Hereinafter, the present invention will be explained in more detail based on the embodiments shown in FIGS. 2 and 3.

The expansion joint structure of the present invention consists of an expansion joint 1 with a unique structure and an anchor bolt 3 buried and fixed in the road floor plate 2.
It consists of a combination of

As shown in FIG. 2A, the expansion joint 1 includes a load support part 4 and a telescoping part 5 integrally in the width direction, and both sides of the whole are provided with a fixed part A,
It is set as B.

The load support part 4 has an elastic body 6 with a rectangular cross section as a base, and reinforcement members 7 and 8 of the load support part, such as L angles, are opposed to each other at the bottom of both sides, and a top plate 9, such as a steel plate, is provided at the upper center. , are buried respectively.

Bolt holes are provided in the reinforcing member 7 at the fixed portion A at regular intervals in the longitudinal direction of the expansion joint 1.

With respect to the fixed part A, the other side of the load support part 4 (referred to as the sliding part)
Similarly, elongated holes 10 are provided in the reinforcing member 8 located in the width direction of the expansion joint 1 at regular intervals in the longitudinal direction.

(See Figure 2) The number of long holes 10 does not need to match the number of bolt holes in the reinforcing material.

The top plate 9 has a gap 11 between the road floor plates 2 and 2 facing each other at the joint.
It is the width across.

The elastic part 5 has a bellows structure made of an elastic body, and one side is continuous with the load support part 4. In other words, the elastic body structuring the bellows is the same and continuous with the substrate of the load support part 4, and the other side is continuous with the load support part 4. serves as a fixed part B, in which a reinforcing material 12 for an expandable part such as a U-shaped angle is buried.

Similar to the reinforcement material 7, the reinforcement material 12 has bolt holes for the expansion joint 1.
Holes are drilled at regular intervals in the longitudinal direction.

On one side of the road floor plate 2, the anchor bolt 3 is embedded and fixed in a position corresponding to the elongated hole 10 of the reinforcing member 8 in the sliding part of the load support part 4 in a position controlled manner.

The anchor bolt 3 has a width along the elongated hole 10, and the amount of protrusion is such that the bolt can be tightened, for example, on the upper part of the reinforcing member 8 so that the sliding part F of the load support part 4 does not float upward.

Note that the elongated hole 10 has a sufficient length to allow for the maximum amount of expansion and contraction of the road.

Anchor bolts 13 are also buried in the road floor plates 2, 2 at positions corresponding to the bolt holes of the reinforcing members 7, 8 in the fixed portion A-B of the expansion joint 1, with their positions restricted.

The expansion joint 1 configured as described above has a load support portion 4 with a clearance 1
1, then insert the elongated hole 1 in the reinforcing material 8 of the sliding part.
The anchor bolt 3 is inserted into the anchor bolt 3 and engaged with a nut so as to prevent the sliding part from lifting up, and then the fixing parts A-B at both ends are inserted into the anchor bolt 13 and fixed with nuts.

The expansion joint structure according to the present invention has been described above, and has the following effects.

(2) Since the elastic part 5 is made of an elastic bellows structure, it can accommodate a relatively large amount of expansion and contraction of the road.

(2) Since the expansion and contraction of the bellows structure mainly changes in its axial direction, there is no risk that the expansion and contraction part itself will swell upward as in the case of the corrugated structure shown in FIG.

■ Utilizing the above characteristics ■■, even when used in areas with wide joint spacing, the anchor bolt 3 guides the sliding parts (especially the sliding parts of the load support part) in the width direction without lifting up. Therefore, it can absorb a large amount of expansion and contraction.

In this way, the drawbacks of conventional expansion joints are solved, as well as the difficulties that arise when a wide expansion joint is used.

Figure 3 assumes a case where the sliding part is longer (in the width direction) than the one in Figure 2. In such a case, in order to reduce the increase in friction, there is a gap between the sliding part and the road floor plate 2. Smooth surface material such as synthetic resin with a smooth surface such as tetrafluoroethylene 14
It is possible to intervene.

In this way, the sliding of the central part of the expansion joint 1 is improved, and when the joint is subjected to compressive force, the acting force in the width direction is further prevented from being dispersed vertically and becoming a force that bulges the central part. be able to.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional example; Fig. 4 A is a cross-sectional view of a conventional example;
Cross-sectional view of the embodiment, Figure 2 is a plan view of Figure 2 A. Figure 3 is a cross-sectional view of the second embodiment of the present invention. Figure 4 is an expansion joint obtained in the process of completing the present invention. FIG. 1... Expansion joint, 2... Road floor plate, 3
...Protrusion, 4...Load support part, 5...
. . . Expandable portion, 6 . . . Base of elastic body, 7. Death...Reinforcement material, 9...Top plate, 10...
...Long hole, 12...Reinforcement material.

Claims (1)

[Scope of Claim for Utility Model Registration] An expansion joint that integrally includes a load support part and an expandable part in the width direction, the load support part having a rectangular cross-sectional elastic body with reinforcement members facing each other at the bottom of both sides. In addition, a top plate is embedded in the upper center, one side is a fixed part A, the other side is a sliding part, and the reinforcing material of the fixed part A has bolt holes at regular intervals in the longitudinal direction, and the sliding part is The reinforcing material has elongated holes that are long in the width direction at regular intervals in the longitudinal direction. The above-mentioned expansion joint, which has a bellows structure made of an elastic material and has a fixing part B with a reinforcing material embedded in the bottom part with bolt holes, is attached to each of the road floor plates facing each other at the joint part at both fixing parts A and B. 1. A road expansion joint structure, characterized in that the expansion joint structure is fixed, and anchor bolts fixed to the road floor plate are engaged with each of the elongated holes in the sliding part.